This is what happens when a fabric dye is exposed to extreme lighting conditions. As you can see, some dyes hold up, and some colors wash out.This is the reason for the military's NIR standards for their uniforms and gear.

Some of the more interesting items that you can see in this series of photos are:-The 1990's standard-issue woodland camo hat and bdu jacket in the upper left has bleached completely except for the black splotches.-The hook'n'loop patch on the front of the Flectarn jacket also has poor spectral qualities.-The Athletic Works woodland camo wicking shirt in the lower right shows it has very little spectral stability as well.-The scarf bleaches easily.-The mil-spec OD Boonie hat in the upper right surprisingly also does badly.

I used a blacklight for the Ultraviolet photo, and a mix of 850nm and 940nm LEDs for the Infrared photo. All three taken with a Canon PowerShot A590 IS. Great Camera. (cheap too, I recommend it)

Well, it does seem to have been printed with techniques that retained most of the contrast between the colors throughout the tested wavelengths. (except for the brown and green, which blended together) The red swaps value with the green/brown mix in the infrared photo, but it still manages to retain its pattern.

Now this isn't determining much about its effectiveness in environment though. That's a different test. (That I hope to do soon using a different technique)

But, as I said, computers and electronics (satellites and wireless included) are the only TRUE new things when comparing to WW2. Other than that, it's the mathematics, physics, materials and the sort that have improved the things already there during the war.

The Gotha you mention, that's a really cool flying wing, I like it a lot. And that's interesting about using charcoal and wood-glue to absorb radar waves that it mentions in the article, I hadn't heard of that!